Fig. 1. Experimental setup of the proposed fiber laser.

Fig. 2. Output laser spectrum at a pump wavelength of 1550 nm; inset shows 17 times OSA repeated scans in ∼90  min measurement time.

Fig. 3. (Color online) (a) Wide tunability of dual-wavelength operation with power-equalized output; Inset-1 and Inset-2 show the zoomed in laser spectra under the pump wavelengths of 1520 and 1610 nm, respectively. (b) Corresponding optimal pump power for power-equalized output of dual-wavelength lasing.

Fig. 4. (Color online) Beat frequency of dual-wavelength operation changing along with the pump wavelength; Inset-1 and inset-2 show the RF beating spectra at the pump wavelengths of 1500 and 1630 nm, respectively.

Fig. 5. For dual-wavelength operation, (a) the beat frequency long-term stability in 1 h measurement time and (b) the beat-frequency-induced temporal fluctuation in 50 μs measurement time.

Fig. 6. (Color online) (a) Long-term stability of the total output power of dual-wavelength operation; (b) temporal fluctuations of the Brillouin laser and the TLS output, respectively.